Evaporated fuel treatment device for motorcycle

ABSTRACT

A charge pipe passage includes: a first engine-side pipe passage part which extends vertically; a second engine-side pipe passage part which is connected to a lower end of the first engine-side pipe passage part on one side in the vehicle widthwise direction and extends from one side to the other side in the vehicle widthwise direction above the engine body; and a third engine-side pipe passage part which is communicably connected to the second engine-side pipe passage part on the other side in the vehicle widthwise direction and is connected to the engine body, and at least a part of the charge pipe passage between a frame-side support part and an engine-side support part is formed of an elastic tube.

CROSS-REFERENCE TO RELATED APPLICATION

The present application claims the benefit of priority to JapanesePatent Application No. 2011-063114, filed on Mar. 22, 2011, the entirecontent of which is incorporated by reference.

TECHNICAL FIELD

The present disclosure relates to a motorcycle which includes a fueltank which is arranged below a rider's seat and is supported on avehicle body frame, a power unit which includes an engine generatingpower for driving a rear wheel, is arranged below the fuel tank and isswingably supported on the vehicle body frame, and a charge pipe passagewhich introduces a fuel gas from the fuel tank to an engine body suchthat the fuel gas evaporated in the fuel tank is absorbed by oil in theengine body of the engine, and more particularly to the improvement ofan evaporated fuel treatment device.

BACKGROUND OF THE INVENTION

A device where a fuel gas generated in a fuel tank is absorbed by oil inan engine body is known by JP-UM-A-49-88172.

SUMMARY OF THE INVENTION

However, with respect to a motorcycle, when a fuel gas generated in afuel tank is introduced to an engine body side through a charge pipepassage as in the case of the motorcycle disclosed in above-mentionedJP-UM-A-49-88172, there exists a possibility that oil in the engine bodyflows out to a charge pipe passage side when the motorcycle falls.Further, when an engine is a unit-swing-type engine, there also arises adrawback that it is necessary to mount a swing absorption part on thecharge pipe passage.

The present disclosure has been made in view of such circumstances, andit is an object of the present disclosure to provide an evaporated fueltreatment device for a motorcycle where a charge pipe passage can followthe swinging of an engine while suppressing the flowout of oil toward acharge pipe passage side from an engine body when the motorcycle falls.

To achieve the above-mentioned object, according to the first technicalfeature of the present disclosure, there is provided an evaporated fueltreatment device for a motorcycle which includes: a fuel tank which isarranged below a rider's seat and is supported on a vehicle body frame;a power unit which includes an engine generating power for driving arear wheel, is arranged below the fuel tank and is swingably supportedon the vehicle body frame; and a charge pipe passage which introduces afuel gas from the fuel tank to an engine body such that the fuel gasevaporated in the fuel tank is absorbed by oil in the engine body of theengine, wherein the charge pipe passage includes: a first engine-sidepipe passage part which is arranged above the engine body in avertically extending manner on one side in the vehicle widthwisedirection of the engine body; a second engine-side pipe passage partwhich is communicably connected to a lower end of the first engine-sidepipe passage part on one side in the vehicle widthwise direction andextends from one side to the other side in the vehicle widthwisedirection above the engine body; and a third engine-side pipe passagepart which is connected to the second engine-side pipe passage part onthe other side in the vehicle widthwise direction and is connected tothe engine body, a frame-side support part which supports the firstengine-side pipe passage part is mounted on the vehicle body frame, anengine-side support part which supports the second engine-side pipepassage part is mounted on the engine, and at least a part of the chargepipe passage between the engine-side support part and the frame-sidesupport part is formed of an elastic tube.

The present disclosure also has, in addition to the constitution of thefirst technical feature, the second technical feature that the enginebody includes a crankcase and a cylinder head which is arranged in frontof the crankcase, and the second engine-side pipe passage part isarranged so as to pass below an intake device which extends rearwardlyfrom an upper side surface of the cylinder head.

The present disclosure also has, in addition to the constitution of thesecond technical feature, the third technical feature that theengine-side support part is mounted on the engine at a position closerto one side in the vehicle widthwise direction than the intake device asviewed in a plan view.

The present disclosure also has, in addition to the constitution of anyone of the first to third technical features, the fourth technicalfeature that the vehicle body frame includes a pair of left and rightseat frames which has inclined parts extending rearwardly and upwardlyrespectively, the power unit is swingably supported on the vehicle bodyframe below the seat frames, and the frame-side support part is arrangedat an oblique rearward and upward position from the engine-side supportpart and is mounted on the inclined part of the seat frame on one sidein the vehicle widthwise direction out of both seat frames.

The present disclosure also has, in addition to the constitution of thefourth technical feature, the fifth technical feature that a crossmember is provided between the pair of seat frames behind the frame-sidesupport part, the fuel tank which is arranged behind the cross member issupported on both seat frames, and the charge pipe passage includes acommunication pipe passage part which is communicably connected to anupper end of the first engine-side pipe passage part on one side in thevehicle widthwise direction, extends toward the other side in thevehicle widthwise direction along the cross member, and is connected tothe fuel tank.

A second cross member 38 in the embodiment corresponds to the crossmember of the present disclosure.

According to the first technical feature of the present disclosure, thecharge pipe passage includes: the first engine-side pipe passage partwhich is arranged above the engine body in a vertically extending manneron one side of the engine body in the vehicle widthwise direction; thesecond engine-side pipe passage part which is connected to the lower endof the first engine-side pipe passage part on one side in the vehiclewidthwise direction and extends from one side to the other side in thevehicle widthwise direction above the engine body; and the thirdengine-side pipe passage part which is communicably connected to thesecond engine-side pipe passage part on the other side in the vehiclewidthwise direction and is connected to the engine body and hence, it ispossible to suppress the flowout of oil in the engine body to the insideof the charge pipe passage when the motorcycle falls. Further, theframe-side support part which supports the first engine-side pipepassage part is mounted on the vehicle body frame, the engine-sidesupport part which supports the second engine-side pipe passage part ismounted on the engine, and at least a part of the charge pipe passagebetween the engine-side support part and the frame-side support part isformed of the elastic tube and hence, the charge pipe passage can followthe swinging of the engine.

According to the second technical feature of the present disclosure, thesecond engine-side pipe passage part passes below the intake devicewhich extends rearwardly from an upper side surface of the cylinder headprovided to the engine body and hence, a part of the charge pipe passagecan be arranged by making use of a dead space below the intake device.

According to the third technical feature of the present disclosure, theengine-side support part is arranged at a position closer to one side inthe vehicle widthwise direction than the intake device as viewed in aplan view and hence, a part of the charge pipe passage which passesbelow the intake device can be fixed such that the part of the chargepipe passage does not swing relative to the engine body and hence, theintake device can be arranged close to the engine body while obviatingthe contact of the intake device with the charge pipe passage thuscontributing to making the engine compact.

According to the fourth technical feature of the present disclosure, theengine body is swingably supported on the vehicle body frame below thepair of left and right seat frames extending rearwardly and upwardly,and the frame-side support part is arranged at an oblique rearward andupward position from the engine-side support part and is mounted on theinclined part of the seat frame on one side in the vehicle widthwisedirection out of both seat frames and hence, the engine-side supportpart and the frame-side support part can be arranged in a spaced apartmanner from each other in the longitudinal direction whereby adiffraction amount of the elastic tube caused by the swinging of thepower unit can be made small.

According to the fifth technical feature of the present disclosure, thefuel tank which is arranged behind the cross member provided between thepair of seat frames behind the frame-side support part is supported onboth seat frames, and the communication pipe passage part whichconstitutes a part of the charge pipe passage is communicably connectedto the upper end of the first engine-side pipe passage part on one sidein the vehicle widthwise direction, extends toward the other side in thevehicle widthwise direction along the cross member, and is connected tothe fuel tank. Accordingly, the flowout of oil into the inside of thecharge pipe passage from the engine body side can be more effectivelysuppressed.

BRIEF DESCRIPTION OF THE DRAWINGS

The advantages of the invention will become apparent in the followingdescription taken in conjunction with the drawings, wherein:

FIG. 1 is a plan view showing a rear part of a vehicle body frame, afuel tank and an engine;

FIG. 2 is a view as viewed in the direction indicated by an arrow 2 inFIG. 1;

FIG. 3 is a view as viewed in the direction indicated by an arrow 3 inFIG. 1;

FIG. 4 is a perspective view as viewed in the direction indicated by anarrow 4 in FIG. 1;

FIG. 5 is a perspective view as viewed in the direction indicated by anarrow 5 in FIG. 1;

FIG. 6 is a side view of a motorcycle;

FIG. 7 is a view showing the motorcycle in a state where a rider's seatis omitted as viewed in the direction indicated by an arrow 7 in FIG. 6;

FIG. 8 is a perspective view of a part shown in FIG. 7 as viewed from anoblique anterior angle;

FIG. 9 is a cross-sectional view taken along a line 9-9 in FIG. 7;

FIG. 10 is a view as viewed in the direction indicated by an arrow 10 inFIG. 1;

FIG. 11 is an enlarged cross-sectional view taken along a line 11-11 inFIG. 7; and

FIG. 12 is a cross-sectional view taken along a line 12-12 in FIG. 2.

DETAILED DESCRIPTION OF THE INVENTION

An embodiment of the present disclosure is explained in conjunction withFIG. 1 to FIG. 12. In the explanation of the embodiment madehereinafter, directions such as “frontward direction” and “rearwarddirection”, and “leftward direction” and “rightward direction” followthe directions as viewed from a rider who rides on a motorcycle.Further, in the explanation made hereinafter, “ . . . ” is used foromitting the repetition of the use of the same reference symbol.

Firstly, in FIG. 1 to FIG. 5, a pair of left and right seat frames 15,15 which constitutes a part of a vehicle body frame F of a scooter-typemotorcycle is formed of a pipe. The pair of left and right seat frames15, 15 includes inclined parts 15 a . . . which are inclined rearwardlyand upwardly and horizontal parts 15 b . . . which extend rearwardlyfrom upper ends of the inclined parts 15 a . . . respectively, and rearends of both horizontal parts 15 b . . . are integrally connected toeach other by a connection part 16.

A front part of a power unit P is supported on the vehicle body frame Fin a vertically swingable manner by way of a link mechanism 17 belowboth seat frames 15 . . . , and a rear wheel WR which is arranged on arear right side of the power unit P is pivotally supported on a rearpart of the power unit P. Further, the power unit P is constituted of aforced air-cooled single cylinder 4-cycle engine E which generates powerfor driving the rear wheel WR and a continuously variable transmission Mwhich is arranged between the engine E and the rear wheel WR, and a rearcushion unit 18 is arranged between a connection part between theinclined part 15 a and the horizontal part 15 b of the left seat frame15 out of both seat frames 15 . . . and a rear part of the power unit P.

An engine body 19 of the engine E includes a crankcase 20 and a cylinderhead 22 which is arranged in front of the crankcase 20. The continuouslyvariable transmission M is housed in the inside of a transmission case23 which extends rearwardly from the engine body 19 while using a partof the crankcase 20 as a constitutional element thereof, and the rearwheel WR is pivotally supported on a rear part of the transmission case23.

A fan (not shown in the drawing) which is rotated in response to anoperation of the engine E is housed in the transmission case 23. one endportion of an intake duct 24 having a bellows shape is connected to afront part of the transmission case 23 for introducing cooling air intothe inside of the transmission case 23 using the fan, and the other endportion of the intake duct 24 is connected to a lower part of theinclined part 15 a of the left seat frame 15. That is, air from theinside of the left seat frame 15 is introduced into the inside of thetransmission case 23 as cooling air.

Most of the engine body 19 is covered with a shroud 25, and is housed inthe shroud 25. The fan (not shown in the drawing) which sucks coolingair into the inside of the shroud 25 from an intake port 26 formed in aright side wall of the shroud 25 is housed in the shroud 25 in a statewhere the fan is driven by the engine E.

An intake device 28 is connected to an upper side surface of thecylinder head 22 of the engine body 19. The intake device 28 includes anair cleaner 29 which is arranged on a left side of the rear wheel WR, aconnecting tube 30 which has an upstream end thereof connected to theair cleaner 29, a throttle body 31 which is connected to a downstreamend of the connecting tube 30, and an intake pipe 32 which connects thethrottle body 31 and the cylinder head 22. A fuel injection valve 33 ismounted on the intake pipe 32.

Further, an exhaust device 34 is connected to a lower side surface ofthe cylinder head 22, and the exhaust device 34 includes an exhaustmuffler 35 which is arranged on a right side of the rear wheel WR, andan exhaust pipe 36 which connects the exhaust muffler 35 and thecylinder head 22 to each other.

A first cross member 37 is provided between intermediate portions of theinclined parts 15 a . . . of both seat frames 15 . . . which constitutea part of the vehicle body frame F in a state where the first crossmember 37 straddles a front part of the engine body 19, and a secondcross member 38 is provided between connection parts between theinclined parts 15 a . . . and the horizontal parts 15 b . . . of bothseat frames 15 . . . .

As shown in FIG. 6, the vehicle body frame F is covered with a vehiclebody cover 39 made of a synthetic resin, and a tandem-type rider's seat40 is arranged above a rear part of the vehicle body cover 39.

The fuel tank 42 which is arranged below the rider's seat 40 issupported on a rear part of the vehicle body frame F in a state wherethe fuel tank 42 is arranged between the second cross member 38 which isprovided between both seat frames 15 . . . and the connection part 16which integrally connects the rear parts of both seat frames 15 . . . toeach other. The fuel tank 42 is arranged above the power unit P.

To explain the embodiment also in conjunction with FIG. 7 to FIG. 9, thefuel tank 42 is covered with a tank cover 44 from above, and the tankcover 44 is integrally connected to a rear upper edge of asynthetic-resin-made storage box 43 which is arranged in front of thefuel tank 42 between both seat frames 15 . . . . The tank cover 44extends rearwardly from the storage box 43 in a state where the tankcover 44 passes through a space formed between the rider's seat 40 andthe fuel tank 42. Further, the storage box 43 is formed with an openedupper end, and this upper-end opening portion of the storage box 43 isclosed by a front part of the rider's seat 40.

To focus on FIG. 9, the fuel tank 42 is formed by joining an upper tankhalf body 45 which has a box shape and opens downwardly and a lower tankhalf body 46 which has an box shape and opens upwardly to each other,and a flange part 42 a which projects outwardly is formed on a jointportion of the upper tank half body 45 and the lower tank half body 46.

A first stay 47 is fixedly mounted on a center portion of the secondcross member 38 in the vehicle widthwise direction in an upwardlyprojecting manner, and a front portion of the flange part 42 a of thefuel tank 42 is fastened to and is supported on the first stay 47.Further, second stays 48 . . . which project upwardly are fixedlymounted on rear portions of the horizontal parts 15 b . . . of both seatframes 15 . . . respectively, and both left and right rear portions ofthe flange part 42 a of the fuel tank 42 are fastened to and aresupported on the second stays 48 . . . .

A third stay 49 which projects downwardly is fixedly mounted on thesecond cross member 38 at a portion where the first stay 47 is fixedlymounted, a fourth stay 50 which projects vertically is fixedly mountedon the connection part 16 which integrally connects the rear parts ofboth seat frames 15 . . . to each other, and a fender 51 which isarranged between the fuel tank 42 and the rear wheel WR so as to coverthe rear wheel WR from above is supported on a lower part of the thirdstay 49 and a lower part of the fourth stay 50.

A rear cover 52 which constitutes a part of the vehicle body cover 39and is contiguously arranged with a rear part of the tank cover 44 and acarrier 53 which is arranged behind the rider's seat 40 are supported onan upper portion of the fourth stay 50 by fastening the rear cover 52and the carrier 53 together by threadedly engaging bolts 55 with nuts 54fixedly mounted on the upper portion of the fourth stay 50.

Here, projecting parts 44 a . . . which project more outwardly than therider's seat 40 are integrally formed with both sides of the tank cover44, and both side portions of the carrier 53 are formed such that theside portions of the carrier 53 are smoothly and contiguously arrangedwith the projecting parts 44 a . . . . Both projecting parts 44 a . . .and both side portions of the carrier 53 function as a grab rail which apillion who is seated on a rear part of the rider's seat 40 can grasp.

To explain the embodiment also in conjunction with FIG. 10, the rearpart of the tank cover 44 which covers the fuel tank 42 from above issupported on a fifth stay 56 which is formed into an approximatelydownwardly-opened U shape in a state where the rear part of the tankcover 44 straddles the rear part of the fuel tank 42. Fastening plateportions 56 a . . . which sandwich both left and right rear portions ofthe flange part 42 a of the fuel tank 42 between the second stays 48 . .. and the fastening plate portions 56 a . . . respectively are mountedon both left and right end portions of the fifth stay 56. Bolts 57penetrate the fastening plate portions 56 a . . . and the flange part 42a . . . and are threadedly engaged with welded nuts 58 which are fixedlymounted on lower surfaces of the second stays 48 . . . and hence, thefastening plate portions 56 a . . . of both left and right end portionsof the fifth stay 56 and both left and right rear portions of the flangepart 42 a of the fuel tank 42 are fastened together to the second stays48 . . . respectively. Further, both sides of the rear part of the tankcover 44 are fastened to the fifth stay 56 by bolts 59, 59.

Box receiving members 60, 60 are mounted on both sides of the firstcross member 37, and both sides of a front part of the storage box 43are fastened to both box receiving members 60 . . . by bolts 61, 61 in astate where a resilient member (not shown in the drawing) is interposedbetween both sides of the front part of the storage box 43 and the boxreceiving members 60 . . . .

Here, the rider's seat 40 is rotatably and pivotally supported on anupper portion of a front end of the storage box 43 in a state where therider's seat 40 is rotatable between a closed state where the rider'sseat 40 covers the storage box 43 and the tank cover 44 from above andan open state where the storage box 43 and the tank cover 44 areexposed. A seal member 62 (see FIG. 9) which is resiliently brought intocontact with an upper end of the storage box 43 in a closed state ismounted on a lower surface of the rider's seat 40.

Further, an engaging member 63 is mounted on a lower part of the rider'sseat 40 at a position corresponding to a front part of the tank cover44, and a seat locking opening portion 64 into which the engaging member63 inserted in a state where the rider's seat 40 is closed is mounted ona connection part where the storage box 43 and the tank cover 44 areconnected to each other.

Further, a seat locking stay 65 which is brought into contact with thefront part of the tank cover 44 from below is arranged at a positioncorresponding to the seat locking opening portion 64 such that the frontportion of the flange part 42 a of the fuel tank 42 is sandwichedbetween the seat locking stay 65 and the first stay 47 and hence, thefront portion of the flange part 42 a and the seat locking stay 65 arefastened together to the first stay 47 by a pair of bolts 66, 66.Further, the front part of the tank cover 44 is fastened to the seatlocking stay 65 by bolts 66, 66 which are arranged on both left andright sides of the seat locking opening portion 64.

A seat locking mechanism not shown in the drawing is provided to theseat locking stay 65, and the seat locking mechanism can change over alocked state where the seat locking mechanism is engaged with theengaging member 63 which is inserted into the seat locking openingportion 64 in a state where the rider's seat 40 is closed thus holding aclosed state of the rider's seat 40 and an unlocked state which allows amanipulation to open the rider's seat 40 by releasing the engagementbetween the seat locking mechanism and the engaging member 63.

A fuel filling port 67 is formed in an upper surface of the rear part ofthe fuel tank 42 on one side in the vehicle widthwise direction, thatis, a left side in the vehicle widthwise direction in this embodiment.The fuel filling port 67 is formed of a fuel filling sleeve 68 which isfixedly mounted on the upper tank half body 45 of the fuel tank 42 in anupwardly projecting manner from the upper surface of the fuel tank 42,and the fuel filling port 67 is closed by a cap 69 in anopenable/closeable manner. Further, a tray 70 which receives fuel spiltfrom the fuel filling port 67 is arranged around the fuel filling port67, and the tray 70 is fixed to the fuel filling sleeve 68.

An upper end portion of a pump module 72 for discharging fuel in thefuel tank 42 is fastened to a center portion of the upper surface of thefront part of the fuel tank 42 in the vehicle widthwise direction by aplurality of bolts 73, 73 . . . . A fuel supply tube 74 which iscommunicably connected to the pump module 72 has a portion which extendsfrontwardly from the pump module 72 above the fuel tank 42 on a rightside in the vehicle widthwise direction, a portion which extends alongthe second cross member 38 from a right side to a left side in thevehicle widthwise direction, and a portion which extends toward the fuelinjection valve 33 from the second cross member 38 on a left side in thevehicle widthwise direction partially along the inclined part 15 a ofthe left seat frame 15, and the fuel supply tube 74 having such portionsis connected to the fuel injection valve 33. To support the fuel supplytube 74, an fuel supply tube support member 75 is mounted on the secondcross member 38, fuel supply tube support members 76, 77 are mounted onthe inclined part 15 a of the left seat frame 15, and an fuel supplytube support member 78 is mounted on an upper surface of the shroud 25in the vicinity of the fuel injection valve 33.

An opening portion 79 which allows the fuel filling port 67 formed inthe upper surface of the fuel tank 42 to face upwardly is formed in thetank cover 44, and the tray 70 is resiliently brought into contact witha lower surface of the tank cover 44 so as to close the opening portion79.

A bulging part 80 which dams up the fuel overflown to the outside of theopening portion 79 at the time of supplying fuel to the fuel fillingport 67 from above is formed on the tank cover 44 in an upwardly bulgingmanner in a state where the bulging part 80 is endlessly continued so asto surround the opening portion 79. Particularly, a rear portion 80 a ofthe bulging part 80 largely bulges more upwardly than a front portion ofthe bulging part 80, and both left and right side portions 80 b, 80 bare formed such that an upwardly bulging amount is gradually increasedas the both left and right side portions 80 b, 80 b extend from a frontside to a rear side. Further, a pair of projections 40 a . . . which isformed on a rear lower part of the rider's seat 40 is brought intocontact with an upper portion of the rear portion 80 a of the bulgingpart 80 when an occupant is seated on the rider's seat 40 so that therear part 80 a of the bulging part 80 receives a weight of the rider'sseat 40.

The upper surface of the above-mentioned fuel tank 42 includes a higherpart 81 where the fuel filling port 67 is formed and a lower part 82which is lower than the higher part 81, and the pump module 72 isarranged on the lower part 82. The lower part 82 is arranged on a frontpart of the upper surface of the fuel tank 42 in an offset manner towarda right side in the vehicle widthwise direction, and is formed in adownwardly inclined manner toward the crankcase 20 of the engine body19.

A fuel gas evaporated in the fuel tank 42 is absorbed in oil in thecrankcase 20 which constitutes a fuel absorption means, wherein thecrankcase 20 is arranged below the upper surface of the fuel tank 42such that the fuel gas is absorbed outside the fuel tank 42. The fuelgas generated in the fuel tank 42 is introduced into the crankcase 20through a charge pipe passage 84.

The charge pipe passage 84 includes a first tank-side pipe passage part84 a which is connected to the upper surface of the fuel tank 42, and asecond tank-side pipe passage part 84 b which is communicably connectedwith the first tank-side pipe passage part 84 a and extends toward theother side of the fuel tank 42 from one side of the fuel tank 42 in thevehicle widthwise direction on an end portion thereof on a fuel tank 42side. The first tank-side pipe passage part 84 a extends toward one sideof the fuel tank 42 in the vehicle widthwise direction from a connectionpart 85 connected to the upper surface of the fuel tank 42, and iscommunicably connected to the second tank-side pipe passage part 84 b.In this embodiment, the connection part 85 connected to the uppersurface of the fuel tank 42 is arranged behind the fuel filling port 67and on a center portion of the higher part 81 of the upper surface ofthe fuel tank 42 in the vehicle widthwise direction in an offset mannerfrom the fuel filling port 67 formed in the upper surface of the fueltank 42 on a left side in the vehicle widthwise direction. The firsttank-side pipe passage part 84 a is arranged such that the firsttank-side pipe passage part 84 a extends leftwardly in the vehiclewidthwise direction from the connection part 85, and the secondtank-side pipe passage part 84 b which is connected to the firsttank-side pipe passage part 84 a is arranged such that the secondtank-side pipe passage part 84 b extends toward a right side from theleft side in the vehicle widthwise direction.

The first tank-side pipe passage part 84 a and the second tank-side pipepassage part 84 b are connected to each other such that the firsttank-side pipe passage part 84 a and the second tank-side pipe passagepart 84 b surround the periphery of the fuel filling port 67, a part ofthe first tank-side pipe passage part 84 a and a part of the secondtank-side pipe passage part 84 b are arranged so as to pass below thetray 70 which receives fuel spilled from the fuel filling port 67. APart which constitutes a portion of the first tank-side pipe passagepart 84 a and a portion of the second tank-side pipe passage part 84 band passes below the tray 70 is formed of a metallic pipe 86 which isbent so as to surround a part of the fuel filling sleeve 68. Forexample, two portions of the metallic pipe 86 are held by pipe holdingmembers 87, 87. Mounting members 88, 88 are welded to the higher part 81of the upper surface of the fuel tank 42 corresponding to the pipeholding members 87 . . . , and the pipe holding members 87 . . . aremounted on the mounting members 88 . . . by bolts 89 . . . and nuts 90 .. . . Painting treatment is applied to the fuel tank 42 including themounting members 88 . . . , and the metallic pipe 86 is fastened to thefuel tank 42 to which the painting treatment is applied.

Further, the charge pipe passage 84 includes a third tank-side pipepassage part 84 c which is connected to the second tank-side pipepassage part 84 b on the other side in the vehicle widthwise direction(right side in this embodiment), and has a highest part 91 arranged at ahighest position of the charge pipe passage 84 at an intermediatedposition thereof. The third tank-side pipe passage part 84 c is arrangedto extend frontwardly above the lower part 82 of the upper surface ofthe fuel tank 42.

A part of the third tank-side pipe passage part 84 c which includes atleast the highest part 91 is formed of an elastic tube 92, and thehighest part 91 of the elastic tube 92 is supported on a highest partsupport part 93 mounted on the fuel tank 42 from below.

To focus on FIG. 11, the highest part support part 93 is constituted ofa support plate 94 which is fixedly mounted on the upper surface of thefuel tank 42 and an upper open clamper 95 which is fixedly mounted onthe support plate 94, and the highest part 91 of the elastic tube 92 issupported on an approximately U-shaped holding part 95 a which is formedon a part of the upper open clamper 95 formed of a round rod and opensupwardly from below.

The highest part support part 93 is arranged below the right sideportion 80 b of the bulging part 80 which is formed on the tank cover 44so that a relatively large empty space is formed above the highest partsupport part 93. In view of the above, a rib 44 b which prevents theelastic tube 91 from being upwardly removed from the upper open clamper95 is integrally formed on the tank cover 44 such that the rib 44 btraverses the inside of the right side portion 80 b. It is desirablethat the rib 44 b is arranged just above the upper open clamper 95.Although the rib 44 b is arranged just above the upper open clamper 95in this embodiment, the rib 44 b may be arranged in a slightly offsetmanner in the longitudinal direction of the elastic tube 91 from justabove the upper open clamper 95 provided that the upward removal of theelastic tube 91 from the upper open clamper 95 can be prevented at sucha position.

Further, as clearly shown in FIG. 10, a part of the charge pipe passage84 ranging from the highest part 91 to the connection part 85 with thefuel tank 42 is arranged with a downward gradient toward the connectionpart 85.

A first check valve 96 which prevents a backflow of a fuel gas toward afuel tank 42 side is interposed on a part of the third tank-side pipepassage part 84 c of the charge pipe passage 84 downstream of thehighest part 91 in a state where the first check valve 96 is supportedon the fuel tank 42. The first check valve 96 is arranged above thelower part 82 of the upper surface of the fuel tank 42.

A part of the third tank-side pipe passage part 84 c of the charge pipepassage 84 includes the elastic tube 92 which has a downstream endthereof connected to the first check valve 96 and is arranged above thefuel tank 42, and an elastic tube 97 which has an upstream end thereofconnected to the first check valve 96 and is arranged above the fueltank 42. The elastic tube 92 is held by an upper open clamper 98downstream of a portion thereof held by the upper open clamper 95, andan upstream end portion of the elastic tube 97 is held by an upper openclamper 99.

The upper open clampers 98, 99 are fixedly mounted in common on asupport plate 100 which is fixedly mounted on the upper surface of thefuel tank 42. The removal of the elastic tubes 92, 97 from the upperopen clampers 95, 98, 99 mounted on the upper surface of the fuel tank42 is prevented by the tank cover 44 which covers the fuel tank 42 fromabove.

A branch part 101 is formed on the third tank-side pipe passage part 84c of the charge pipe passage 84 at a position closer to the fuel tank 42side than the first check valve 96. An atmospheric air introducing pipepassage 102 which introduces atmospheric air to the inside of the fueltank 42 is connected to the branch part 101, and a second check valve103 which prevents the flow of a fuel gas from the fuel tank 42 side isinterposed on the atmospheric air introducing pipe passage 102. Further,as clearly shown in FIG. 10, the second check valve 103 is arranged at aposition higher than the highest part 91 of the charge pipe passage 84.

The atmospheric air introducing pipe passage 102 opens in atmosphericair below the second check valve 103. In this embodiment, theatmospheric air introducing pipe passage 102 is connected to theconnection part 16 in such a manner that the atmospheric air introducingpipe passage 102 opens in atmospheric air in the pipe-shaped connectionpart 16 which connects rear parts of the pair of left and right seatframes 15 . . . to each other.

Further, a filter 104 is interposed on the atmospheric air introducingpipe passage 102 at a position closer to an atmospheric air open side,that is, the connection part 16 side than the second check valve 103.The filter 104 is interposed on a portion of the atmospheric airintroducing pipe passage 102 which has a downward gradient toward theatmospheric air open side, that is, the connection part 16 side.

The atmospheric air introducing pipe passage 102 includes an elastictube 105 which has one end portion thereof connected to the branch part101 and the other end portion thereof connected to the second checkvalve 103, an elastic tube 106 which has one end portion thereofconnected to the second check valve 103 and the other end thereofconnected to the filter 104, and an elastic tube 107 which has one endportion thereof connected to the filter 104 and the other end portionthereof connected to the connection part 16 of the vehicle body frame F.The elastic tube 106 is arranged in an arcuately bent shape whileconnecting the second check valve 103 and the filter 104 arranged at anoblique rearward and downward position from the second check valve 103,and a part of the elastic tube 106 and the elastic tube 107 are arrangedsuch that these parts have a downward gradient toward the connectionpart 16 while connecting the filter 104 therebetween.

The other end portion of the elastic tube 105 and one end portion of theelastic tube 106 are held by upper open clampers 108, 109 at a positionwhere the second check valve 103 is sandwiched between the elastic tube105 and the elastic tube 106. These upper open clampers 108, 109 arefixedly mounted on the fifth stay 56 which constitutes a part of thevehicle body frame F so that the removal of the elastic tubes 105, 106from these upper open clampers 108, 109 can be prevented by the tankcover 44 which covers the fuel tank 42 from above.

The second check valve 104 is arranged below the rear portion 80 a whichreceives a load from the rider's seat 40 out of the bulging part 80formed on the tank cover 44 which covers the fuel tank 42 from above.

The charge pipe passage 84 includes: a communication pipe passage part84 d which is connected to the third tank-side pipe passage part 84 c onthe other side in the vehicle widthwise direction (a right side in thisembodiment) and extends toward one side in the vehicle widthwisedirection (a left side in this embodiment) along the second cross member38; a first engine-side pipe passage part 84 e which is connected to thecommunication pipe passage part 84 d and is arranged above the enginebody 19 in a vertically extending manner on one side in the vehiclewidthwise direction; a second engine-side pipe passage part 84 f whichis connected to a lower end of the first engine-side pipe passage part84 e on one side in the vehicle widthwise direction and extends from oneside to the other side in the vehicle widthwise direction above theengine body 19; and a third engine-side pipe passage part 84 g which isconnected to the second engine-side pipe passage part 84 f on the otherside in the vehicle widthwise direction and is connected to the enginebody 19.

In this embodiment, the communication pipe passage part 84 d isconnected to the third tank-side pipe passage part 84 c on the rightside in the vehicle widthwise direction and extends leftwardly in thevehicle widthwise direction along the second cross member 38. Thecommunication pipe passage part 84 d is connected to an upper end of thefirst engine-side pipe passage part 84 e on the left side in the vehiclewidthwise direction and extends rightwardly in the vehicle widthwisedirection along the second cross member 38 and is connected to the fueltank 42 through the third, the second and the first tank-side pipepassage parts 84 c, 84 b, 84 a. The first engine-side pipe passage part84 e extends in the vertical direction on the left side in the vehiclewidthwise direction, the second engine-side pipe passage part 84 f isarranged in an extending manner from the left side to the right side inthe vehicle widthwise direction above the engine body 19, and the thirdengine-side pipe passage part 84 g is connected to the crankcase 20 ofthe engine body 19 on the right side in the vehicle widthwise direction.

A frame-side support part 110 which supports an intermediate part of thefirst engine-side pipe passage part 84 e is mounted on the vehicle bodyframe F, and on an upper surface of the shroud 25 of the engine E, anengine-side support part 111 which supports an intermediate part of thesecond engine-side pipe passage part 84 f is mounted. The engine-sidesupport part 111 is mounted on the upper surface of the shroud 25together with the fuel supply tube support member 77 by bolts 112.

The engine-side support part 111 is arranged at a position closer to oneside in the vehicle widthwise direction (left side in this embodiment)than the intake device 28 as viewed in a plan view, and the frame-sidesupport part 110 is arranged at an oblique rearward and upward positionfrom the engine-side support part 111, and is mounted on the inclinedpart 15 a of the seat frame 15 on one side in the vehicle widthwisedirection (left side in this embodiment) out of both seat frames 15 . .. .

Further, at least a part of the charge pipe passage 84 between theengine-side support part 111 and the frame-side support part 110 isformed of the elastic tube 97. In this embodiment, the elastic tube 97which forms a part of the third tank-side pipe passage part 84 c and hasone end portion thereof connected to the first check valve 96constitutes the whole communication pipe passage part 84 d, the wholefirst engine-side pipe passage part 84 e, the whole second engine-sidepipe passage part 84 f and a part of the third engine-side pipe passagepart 84 g.

Further, as shown in FIG. 1, the second engine-side pipe passage part 84f is arranged so as to pass below the connecting tube 30 and thethrottle body 31 of the intake device 28.

As shown in FIG. 12, the third engine-side pipe passage part 84 g isconnected to the crankcase 20 in such a manner that the thirdengine-side pipe passage part 84 g is arranged adjacent to, inside inthe vehicle widthwise direction, a fuel supply pipe 116 which isarranged on a right side part of the crankcase 20 for supplying oil tothe inside of the crankcase 20 of the engine body 19, extends obliquelyin the upward direction, and has an upper end portion thereof closed bya cap 115. The third engine-side pipe passage part 84 g is constitutedof a part of the elastic tube 97, and a metallic tubular body 117 whichhas an upper end portion thereof connected to the elastic tube 97 and isfixedly mounted on the crankcase 20. The other end of the tubular body117 opens in the inside of the crankcase 20 below an oil surface L ofoil in the crankcase 20. Accordingly, a fuel gas which is evaporated inthe fuel tank 42 and is introduced through the charge pipe passage 84 isabsorbed by oil in the crankcase 20.

Next, the manner of operation of this embodiment is explained. Thecharge pipe passage 84 which introduces a fuel gas evaporated in thefuel tank 42 toward the crankcase 20 which constitutes the fuelabsorption means includes the first tank-side pipe passage part 84 awhich is connected to the upper surface of the fuel tank 42 and thesecond tank-side pipe passage part 84 b which is communicably connectedwith the first tank-side pipe passage part 84 a and extends toward theother side (right side in this embodiment) of the fuel tank 42 from oneside (left side in this embodiment) of the fuel tank 42 in the vehiclewidthwise direction on the end portion thereof on the fuel tank 42 side.The first tank-side pipe passage part 84 a and the second tank-side pipepassage part 84 b are fixed to the upper surface of the fuel tank 42.Accordingly, even when the first tank-side pipe passage part 84 a isconnected to the fuel tank 42 at either one of positions in the vehiclewidthwise direction, it is possible to suppress an amount of fuel whichflows out from the fuel tank 42 toward the crankcase 20 through thecharge pipe passage 84 when the motorcycle falls. Further, at least thepart of the charge pipe passage 84 can be mounted on the fuel tank 42 inadvance and hence, the structure can contribute to the enhancement ofassembling property.

The first tank-side pipe passage part 84 a extends toward one side (leftside in this embodiment) of the fuel tank 42 from the connection part 85connected to the upper surface of the fuel tank 42 in the vehiclewidthwise direction, and is connected to the second tank-side pipepassage part 84 b. Accordingly, the flowout of fuel when the motorcyclefalls can be effectively suppressed.

The fuel filling port 67 is formed in the upper surface of the fuel tank42 on one side in the vehicle widthwise direction (left side in thisembodiment), and the first tank-side pipe passage part 84 a which isconnected to the upper surface of the fuel tank 42 at a position offsetfrom the fuel filling port 67 and the second tank-side pipe passage part84 b are connected to each other in a state where the first tank-sidepipe passage part 84 a and the second tank-side pipe passage part 84 bsurround the periphery of the fuel filling port 67. Accordingly, thepart of the first tank-side pipe passage part 84 a and the part of thesecond tank-side pipe passage part 84 b can be arranged with largecurvatures respectively by making use of a dead space around the fuelfilling port 67 thus easing the arrangement of the first tank-side pipepassage part 84 a and the second tank-side pipe passage part 84 b.

The tray 70 which receives fuel spilt from the fuel filling port 67 isarranged around the fuel filling port 67, and the part of the firsttank-side pipe passage part 84 a and the part of the second tank-sidepipe passage part 84 b are arranged to pass below the tray 70.Accordingly, even when the part of the first tank-side pipe passage part84 a and the part of the second tank-side pipe passage part 84 b arearranged so as to surround the fuel filling port 67, an area of the tray70 can be increased.

The charge pipe passage 84 is connected to the second tank-side pipepassage part 84 b on the other side in the vehicle widthwise direction(right side in this embodiment), and includes the third tank-side pipepassage part 84 c which has the highest part 91 arranged at the highestposition of the charge pipe passage 84 at an intermediated positionthereof. Accordingly, the flowout of fuel when the motorcycle falls canbe more effectively suppressed.

Further, the part of the third tank-side pipe passage part 84 c whichincludes at least the highest part 91 is formed of the elastic tube 92,and the highest part 91 of the elastic tube 92 is supported on thehighest part support part 93 mounted on the fuel tank 42 from below.Accordingly, the degree of freedom in design can be enhanced bydetermining the height of the highest part 91 based on the height of thehighest part support part 93. Further, the part of the charge pipepassage 84 ranging from the highest part 91 to the connection part 85with the fuel tank 42 is arranged with a downward gradient toward theconnection part 85 side. Accordingly, fuel stored in the charge pipepassage 84 between the highest part 91 and the fuel tank 42 can beeasily returned to the fuel tank 42 side.

The downstream end of the charge pipe passage 84 is connected to thecrankcase 20 in a state where the downstream end of the charge pipepassage 84 opens in the oil in the crankcase 20, and the first checkvalve 96 which prevents a backflow of a fuel gas toward the fuel tank 42is interposed on a portion of the charge pipe passage 84 downstream ofthe highest part 91. Accordingly, it is possible to effectively preventoil in the crankcase 20 from flowing toward the fuel tank 42 by thefirst check valve 96, and it is also possible to enhance assemblingproperty by supporting the first check valve 96 on the fuel tank 42.

The upper surface of the fuel tank 42 includes the higher part 81 inwhich the fuel filling port 67 is formed and the lower part 82 lowerthan the higher part 81, and the first check valve 96 is arranged on thelower part 82. Accordingly, it is possible to prevent the first checkvalve 96 from taking the high arrangement position. Further, the lowerpart 82 is formed in a downwardly inclined manner toward the crankcase20. Accordingly, it is possible to make the flow of a fuel gas whichpasses through the first check valve 96 smooth.

The atmospheric air introducing pipe passage 102 which introduces anatmospheric air to the inside of the fuel tank 42 is connected to thebranch part 101 which is formed on the third tank-side pipe passage part84 c of the charge pipe passage 84 at a position closer to the fuel tank42 side than the first check valve 96, and the second check valve 103which prevents the flow of fuel from the fuel tank 42 side is interposedon the atmospheric air introducing pipe passage 102. Accordingly, whenthe pressure inside the fuel tank 42 becomes a negative pressure,atmospheric air is introduced into the inside of the fuel tank 42 so asto adjust the pressure in the fuel tank 42 to an atmospheric pressure.Further, it is possible to prevent a fuel gas from being discharged tothe outside through the atmospheric air introducing pipe passage 102 bythe second check valve 103.

The parts of the elastic tube 92, 97 which constitute at least a part ofthe charge pipe passage 84 and are arranged above the fuel tank 42 areheld by the upper open clampers 95, 98, 99 which are mounted on theupper surface of the fuel tank 42, and the fuel tank 42 is covered fromabove with the tank cover 44 which prevents the removal of the elastictubes 92, 97 from the upper open clampers 95, 98, 99. Accordingly, thepart of the charge pipe passage 84 can be supported on the fuel tank 42with the simple structure and hence, the assembling property can beenhanced.

Paint treatment is applied to the outer surface of the fuel tank 42, andthe metallic pipe 86 which constitutes the part of the charge pipepassage 84 is fastened to the fuel tank 42. Accordingly, compared to acase where the metallic pipe 86 is fixed to the fuel tank 42 by welding,it is unnecessary to apply masking to the metallic pipe 86 and hence, apainting cost can be reduced.

The second check valve 103 is arranged at a position higher than thehighest part 91 formed on the third tank-side pipe passage part 84 c ofthe charge pipe passage 84 and hence, the second check valve 103suppresses the inflow of fuel toward the second check valve 103 thusenhancing durability of the second check valve 103 by preventing theadhesion of fuel to the second check valve 103.

The branch part 101 is arranged on the third tank-side pipe passage part84 c at the position closer to the fuel tank 42 side than the highestpart 91. Accordingly, even if fuel flown out from the fuel tank 42 flowsinto the atmospheric air introducing pipe passage 102 at the connectionpart with the charge pipe passage 84, that is, between the branch part101 and the second check valve 103 when a motorcycle falls, fuel in theatmospheric air introducing pipe passage 102 returns to a positionupstream of the highest part 91 of the charge pipe passage 84 when themotorcycle is raised after falling and hence, the flow of fuel towardthe engine body 19 can be prevented.

The atmospheric air introducing pipe passage 102 opens in atmosphericair below the second check valve 103. Accordingly, even when waterenters the inside of the atmospheric air introducing pipe passage 102through an atmospheric air open end of the atmospheric air introducingpipe passage 102, it is possible to make water which enters theatmospheric air introducing pipe passage 102 difficult to reach thesecond check valve 103. The filter 104 is interposed on the atmosphericair introducing pipe passage 102 at a position closer to the atmosphericair open side than the second check valve 103 and hence, dusts hardlyadhere to the second check valve 103. Further, the filter 104 isinterposed on a part of the atmospheric air introducing pipe passage 102which has a downward gradient toward the atmospheric air open side andhence, even when the filter 104 is wetted with water, it is possible todrain water toward the atmospheric air open end side from the filter104.

On the tank cover 44 which covers the fuel tank 42 from above andincludes the opening portion 79 which upwardly faces the fuel fillingport 67 formed in the upper surface of the fuel tank 42, the bulgingpart 80 which receives a load from the rider's seat 40 and dams up fueloverflown to the outside of the opening portion 79 at the time offilling fuel to the fuel filling port 67 from above is formed in anupwardly bulging manner, and the second check valve 103 is arrangedbelow the bulging part 80. Accordingly, the second check valve 103 isarranged at a high position and hence, it is possible to make waterwhich enters the inside of the atmospheric air introducing pipe passage102 more difficult to reach the second check valve 103.

The charge pipe passage 84 includes: the first engine-side pipe passagepart 84 e which is arranged above the engine body 19 in a verticallyextending manner on one side in the vehicle widthwise direction (leftside in this embodiment) of the engine body 19; the second engine-sidepipe passage part 84 f which is connected to the lower end of the firstengine-side pipe passage part 84 e on one side in the vehicle widthwisedirection and extends from one side to the other side in the vehiclewidthwise direction (right side in this embodiment) above the enginebody 19; and the third engine-side pipe passage part 84 g which isconnected to the second engine-side pipe passage part 84 f on the otherside in the vehicle widthwise direction and is connected to the enginebody 19. Accordingly, it is possible to suppress the flow out of oil inthe engine body 19 to the inside of the charge pipe passage 84 when themotorcycle falls.

Further, the frame-side support part 110 which supports the firstengine-side pipe passage part 84 e is mounted on the vehicle body frameF, the engine-side support part 111 which supports the secondengine-side pipe passage part 84 f is mounted on the shroud 25 of theengine E, and at least a part of the charge pipe passage 84 between theengine-side support part 111 and the frame-side support part 110 isformed of the elastic tube 97 and hence, the charge pipe passage 84 canfollow the swing of the engine E.

The second engine-side pipe passage part 84 f is arranged so as to passbelow the intake device 28 which extends rearwardly from an upper sidesurface of the cylinder head 22 of the engine body 19 and hence, a partof the charge pipe passage 84 can be arranged by making use of a deadspace below the intake device 28.

The engine-side support part 111 is mounted on the engine E at aposition closer to one side in the vehicle widthwise direction than theintake device 28 as viewed in a plan view. Accordingly, a part of thecharge pipe passage 84 which passes below the intake device, that is,the second engine-side pipe passage part 84 f can be fixed such that thesecond engine-side pipe passage part 84 f does not swing relative to theengine body 19 and hence, the intake device 28 can be arranged close tothe engine body 19 while obviating the contact of the intake device 28with the charge pipe passage 84 thus contributing to making the engine Ecompact.

The vehicle body frame F includes the pair of left and right seat frames15 . . . which has the inclined parts 15 a . . . extending rearwardlyand upwardly respectively, the power unit P is swingably supported onthe vehicle body frame F below the seat frames 15 . . . , and theframe-side support part 110 is arranged at an oblique rearward andupward position from the engine-side support part 111 and is mounted onthe inclined part 15 a of the seat frame 15 on one side in the vehiclewidthwise direction (left side in this embodiment) out of both seatframes 15 . . . . Accordingly, the engine-side support part 111 and theframe-side support part 110 can be arranged in a spaced-apart mannerfrom each other in the longitudinal direction and hence, a diffractionamount of the elastic tube 97 caused by the swing of the power unit Pcan be made small.

Further, the second cross member 38 is provided between the pair of seatframes 15 . . . behind the frame-side support part 110, the fuel tank 42which is arranged behind the second cross member 38 is supported on bothseat frames 15 . . . , and the charge pipe passage 84 includes thecommunication pipe passage part 84 d which is communicably connected tothe upper end of the first engine-side pipe passage part 84 e on oneside in the vehicle widthwise direction, extends toward the other sidein the vehicle widthwise direction along the second cross member 38, andis connected to the fuel tank 42. Accordingly, the flowout of oil intothe inside of the charge pipe passage 84 from the engine body 19 sidecan be more effectively suppressed.

Although the embodiment of the present disclosure has been explainedheretofore, the present disclosure is not limited to the above-mentionedembodiment, and various design modifications may be made withoutdeparting from the gist of the present disclosure described in Claims.

Although a specific form of embodiment of the instant invention has beendescribed above and illustrated in the accompanying drawings in order tobe more clearly understood, the above description is made by way ofexample and not as a limitation to the scope of the instant invention.It is contemplated that various modifications apparent to one ofordinary skill in the art could be made without departing from the scopeof the invention which is to be determined by the following claims.

We claim:
 1. An evaporated fuel treatment device for a motorcycle,comprising: a fuel tank arranged below a rider's seat and supported on avehicle body frame; a power unit, including an engine generating powerfor driving a rear wheel, arranged below the fuel tank and swingablysupported on the vehicle body frame; and a charge pipe passageconfigured to introduce a fuel gas from the fuel tank to an engine bodysuch that the fuel gas evaporated in the fuel tank is absorbed by oil inthe engine body of the engine, wherein the charge pipe passagecomprises: a first engine-side pipe passage part arranged above theengine body in a vertically extending manner on one side of the enginebody in a vehicle widthwise direction; a second engine-side pipe passagepart connected to a lower end of the first engine-side pipe passage parton a first side in the vehicle widthwise direction and extends from thefirst side to a second side in the vehicle widthwise direction above theengine body; and a third engine-side pipe passage part connected to thesecond engine-side pipe passage part on the second side in the vehiclewidthwise direction and connected to the engine body, and a frame-sidesupport part configured to support the first engine-side pipe passagepart and is mounted on the vehicle body frame, an engine-side supportpart, which supports the second engine-side pipe passage part, ismounted on the engine, and at least a part of the third engine side pipepassage part located between the engine-side support part and theframe-side support part is formed of an elastic tube.
 2. The evaporatedfuel treatment device for a motorcycle according to claim 1, wherein theengine body comprises: a crankcase and a cylinder head which is arrangedin front of the crankcase, and wherein the second engine-side pipepassage part is arranged so as to pass below an intake device whichextends rearwardly from an upper side surface of the cylinder head. 3.The evaporated fuel treatment device for a motorcycle according to claim2, wherein the engine-side support part is mounted on the engine at aposition closer to the first side in the vehicle widthwise directionthan the intake device as viewed in a plan view.
 4. The evaporated fueltreatment device for a motorcycle according to claim 1, wherein thevehicle body frame comprises: a pair of left and right seat frames whichhave inclined parts extending rearwardly and upwardly respectively,wherein the power unit is swingably supported on the vehicle body framebelow the seat frames, and the frame-side support part is arranged at anoblique rearward and upward position from the engine-side support partand is mounted on the inclined part of the seat frame on the first sidein the vehicle widthwise direction out of both seat frames.
 5. Theevaporated fuel treatment device for a motorcycle according to claim 4,wherein a cross member is provided between the pair of seat framesbehind the frame-side support part, the fuel tank, which is arrangedbehind the cross member, is supported on both seat frames, and thecharge pipe passage comprises: a communication pipe passage part whichis connected to an upper end of the first engine-side pipe passage parton the first side of the vehicle in a widthwise direction, and extendstoward the second side of the vehicle in a widthwise direction along thecross member, and is connected to the fuel tank.
 6. The evaporated fueltreatment device for a motorcycle according to claim 1, wherein the atleast a part of the charge pipe passage is at least a part of the thirdengine-side pipe passage part.
 7. The evaporated fuel treatment devicefor a motorcycle according to claim 1, wherein the first engine-sidepipe passage part and the second engine-side pipe passage part areconnected to each other such that the first engine-side pipe passagepart and the second engine-side pipe passage part surround the peripheryof a fuel filling port.
 8. The evaporated fuel treatment device for amotorcycle according to claim 1, wherein a part of the third engine-sidepipe passage part which includes at least a highest part is formed of anelastic tube.